CVE-2026-65807: Microsoft Excel Remote Code Execution Vulnerability
Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft Excel Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5565.1001Patch KB5002903 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.112.26081010 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in https://aka.ms/OfficeSecurityReleases
Event History
Frequently Asked Questions
What is the severity of CVE-2026-65807?
CVE-2026-65807 has a high severity rating of 8.8.
How do I fix CVE-2026-65807?
To fix CVE-2026-65807, apply the latest security updates provided by Microsoft for affected versions of Excel.
What types of systems are affected by CVE-2026-65807?
CVE-2026-65807 affects Microsoft Excel 2016, Microsoft 365 Apps for Enterprise, as well as various editions of Microsoft Office LTSC for both 2021 and 2024.
What type of vulnerability is CVE-2026-65807?
CVE-2026-65807 is a remote code execution vulnerability caused by type confusion in Microsoft Excel.
What could an attacker achieve by exploiting CVE-2026-65807?
An attacker exploiting CVE-2026-65807 could execute arbitrary code over a network, potentially compromising sensitive data and systems.